The flash point of a residual fuel oil should be used to determine the highest temperature to which oil may be heated（）

During the diesel engine running, the water level of F.W expansion tank should normally kept in the （） level of glass tube.

When does auxiliary burner of incinerator put into operation? （）Ⅰ. start incinerator when it is coldⅡ. the sludge for dealing with is littleⅢ. the sludge for dealing with is largeⅣ. the water and impurity in sludge are too muchⅤ. the temperature in incinerator is lowⅥ. dealing with little solid rubbish

Which of the diesel engine components listed increase air density and helps to improve engine operating efficiency?（）

Using a file without a handle may result in （）

One of the reasons that cause oil flowed from sludge outlet of a self-cleaning separator is（）

If separating effect is not good, which measure should be taken （）

The Port State Control officer may witness a fire drill carried out by the crew assigned to these duties on the（）

Thermostatic steam pressure reducing valves are used in the fuel oil service system to control the（）

The cetane rating of diesel fuel is an indication of the （）